1 Talk Chance on use Edit History An effect that has some chance to activate on a use. Usually appears in an item's tooltip as "Chance on use:". Usually lumped into the class of effects called a proc. Read more For the dwarven racial trait, see . Frost resistance is useful in Naxxramas and PvP and vs. some... Frost resistance Nature resistance is the most useful resistance in Ahn'Qiraj, and also for anyone tanking... Nature resistance The Random Secondary Target System (RSTS) is a system deployed by Blizzard to make certain... Random Secondary Target System Related Categories Categories: Gameplay | Game terms